Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae634513d501aea1…

MALICIOUS

PDF

120.2 KB Created: 2021-07-31 03:30:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: a2b394fba1af80f1580a073cfbb22606 SHA-1: 6c71818e4520dae9b34f027920d924976c035244 SHA-256: ae634513d501aea1f5142ddb2318240cf819255cc5cac2017f239c929c495d0d
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document containing numerous links to external PDF files hosted on compromised CMS platforms. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically identified as a phishing trojan. The embedded links likely serve as a lure to download further malicious content or redirect users to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609dd67105cfd---vakojedatabasusewa.pdf In PDF document text
    • https://artofsurfing.com/preview/ckfinder/userfiles/files/lixiraxeru.pdfIn PDF document text
    • http://www.aceitunasdelguadalhorce.es/ckfinder/userfiles/files/87470300924.pdfIn PDF document text
    • http://charivne.info/images/file/medasikajim.pdfIn PDF document text
    • http://www.heksan.com.pl/file/jedibogewuwonetonekok.pdfIn PDF document text
    • https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/d5a8d3def627231fdd2ea89e21a70894/90404786021.pdfIn PDF document text
    • https://elicopter-de-inchiriat.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160afa1ece5d2a---tuzifovulerixozaba.pdfIn PDF document text
    • https://www.formwork.co.uk/wp-content/plugins/super-forms/uploads/php/files/ogtjf2ebvt73tl5v1lbkkikkjn/9120613200.pdfIn PDF document text
    • http://kag.fr/userfiles/file/37439201570.pdfIn PDF document text
    • http://brandnewgoods.net/userfiles/file/29999584941.pdfIn PDF document text
    • https://paperland.bg/uploads/file/15944791415.pdfIn PDF document text
    • https://choiceenergynetwork.com/wp-content/plugins/super-forms/uploads/php/files/8733de5ee8b1f11aa2bdc23ff64d7d39/kevipigasejexuwutab.pdfIn PDF document text
    • http://willtorock.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078d1b8856f6---19826234164.pdfIn PDF document text
    • http://xn--k1akb4c.xn--p1ai/userfiles/file/berekivap.pdfIn PDF document text
    • https://www.waterlooarmsnewforest.co.uk/wp-content/plugins/super-forms/uploads/php/files/cc4d6af3e25dd329e1c1bd3cd135ed2c/89044050200.pdfIn PDF document text
    • https://roadtoring.com/wp-content/plugins/super-forms/uploads/php/files/3a98cff2b84802c47d17331aac4c703f/favanisogolanijeped.pdfIn PDF document text
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/b8p3tic9j662tp0i7lspk2ptbg/83837473769.pdfIn PDF document text
    • https://baxsporthorses.nl/userfiles/file/11509072321.pdfIn PDF document text
    • http://wirheiraten.de/images/file/letoda.pdfIn PDF document text
    • http://pphu-joanna.pl/fckpliki/file/nedeju.pdfIn PDF document text
    • https://medicinasolidale.org/wp-content/plugins/super-forms/uploads/php/files/5c437fbf44c718b6bc3fcecbfe2f27aa/xisowutefedupu.pdfIn PDF document text
    • http://carraracucinecomponibilitrapani.it/userfiles/files/luvodaxejaboriwozapidap.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=paradise+lost+book+9+modern+translationPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00017229.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17229 18004 bytes
SHA-256: a1697daa558dae628b263930a83c26b18995a4047e3da16fe6369a7d6000273b
font_01_sfnt_off0001a0d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A0D9 10808 bytes
SHA-256: 9f5f314ca1f5cc5a2d90ed198ccc88f8de4183dca695c170587fc8e535e248ca
font_02_sfnt_off0001b9bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B9BD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.